炭素固定型アスファルト舗装：Bacillus subtilisとTiO2を用いた道路インフラにおけるCO2隔離の持続可能なアプローチ
Carbon-capturing Bituminous Pavement: A Sustainable Approach to CO2 Sequestration in Road Infrastructure Using Bacillus subtilis and TiO2 for Carbon Sequestration (原題)
S. Premkumar, N. Hasan, R. Madhava Perumal, W. Balkis Banu, G. Arun, R. Kalaivannan
🤖 gxceed AI 要約
日本語
Bacillus subtilis・消石灰・TiO2を組み込んだ炭素固定型アスファルト舗装（CCBP）を実験室規模で検討。尿素分解で生じる炭酸イオンとCa²⁺からCaCO₃を析出させ、28日で104.8 g CO₂/m²の固定能、動的弾性率は9.35%向上した。ただし実験室効率は大気CO2隔離とは異なり、完全な炭素収支や光触媒機能の検証は今後の課題と明記されている。
English
A lab-scale study of carbon-capturing bituminous pavement (CCBP) incorporating Bacillus subtilis, hydrated lime, and TiO2. Urease-driven carbonate precipitation with Ca2+ yielded 104.8 g CO2/m2 over 28 days and a 9.35% dynamic modulus gain. The authors caution that lab efficiency is not atmospheric sequestration and that full carbon mass balance and photocatalytic tests remain future work.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では建設・インフラ分野の脱炭素（グリーンインフラ、公共調達での低炭素資材）がGX政策の焦点の一つ。本論文はSSBJ開示やScope3算定に直接資するものではないが、道路舗装という炭素集約型インフラの固定能評価手法として、建設業の脱炭素技術ロードマップ検討に示唆を与える。
In the global GX context
Globally, hard-to-abate infrastructure emissions are increasingly addressed through embodied-carbon and materials innovation. This paper contributes early-stage evidence on bio-cementation for road pavements, relevant to CSRD/ISSB Scope 3 category 1 (purchased goods) and green public procurement debates, though claims remain lab-scale.
👥 読者別の含意
🔬研究者:バイオセメンテーションとTiO2を組み合わせた舗装の炭酸塩析出・力学特性評価の実験プロトコルと限界が参考になる。
🏢実務担当者:建設・道路分野の脱炭素資材として、舗装の炭素固定能と剛性向上の可能性を把握できるが、実装には現場検証が必要。
🏛政策担当者:公共インフラの低炭素調達基準や炭素固定型資材の評価枠組みを検討する際の基礎的知見となりうる。
📄 Abstract（原文）
The escalating atmospheric CO₂ concentration necessitates sustainable infrastructure solutions. This laboratory-scale study investigates a Carbon-Capturing Bituminous Pavement (CCBP) incorporating a bio-enhanced layer comprising Bacillus subtilis, hydrated lime, and titanium dioxide (TiO₂). The carbon-capture mechanism relies on urease-producing B. subtilis to hydrolyze urea, generating carbonate ions that react with Ca²⁺ from hydrated lime to precipitate CaCO₃. TiO₂ nanoparticles (synthesized via sol-gel) were characterized by XRD (anatase, crystallite size 18±4 nm), TEM (spherical, 22±6 nm), and EDS (Ti/O elemental distribution). The pavement design followed IRC:37-2018 procedures; full compliance was not verified. Controls included a conventional pavement and formulations lacking bacteria, TiO₂, or lime. CO₂ capture efficiency (η) was defined as the ratio of experimentally measured carbonate (by acid-base titration) to the stoichiometric maximum based on lime content, corrected for background carbonates. This laboratory efficiency is not equivalent to atmospheric CO₂ sequestration, and a complete carbon mass balance was not performed. η reached 56.27% by Day 7 under controlled laboratory exposure. Sequestration capacity (g CO₂/m² = moles carbonate × 44 / exposed area 0.045 m²) increased from 12.9±1.1 to 104.8±8.1 g CO₂/m² over 28 days. Dynamic modulus (n=6) was 2444±118 MPa for CCBP vs 2235±96 MPa for conventional (p=0.032), a 9.35% improvement. SEM with complementary XRD/FTIR confirmed calcite precipitates; EDS showed Ca (8.7±0.5 wt%) and Ti (3.2±0.3 wt%), consistent with elemental composition but not proof of photocatalytic function. These results indicate potential for carbonate formation and enhanced stiffness under controlled conditions. Future work will include direct photocatalytic tests, long-term field validation, a complete carbon mass balance, and a full life-cycle assessment before atmospheric sequestration claims can be made.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.13074/jent.2026.09.2632413first seen 2026-10-13 04:39:25
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